If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x-(3/10) = 7/10 // - 7/10
x-(3/10)-(7/10) = 0
x-3/10-7/10 = 0
x-1 = 0 // + 1
x = 1
x = 1
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